On Thu, Jan 05, 2023 at 02:08:23PM +0100, Marek Vasut wrote: > The assignment of block device nodes in Linux is not deterministic by > default, i.e. a newly added eMMC controller or other block device can > change the assignment of /dev/mmcblkN (or other block device node like > e.g. /dev/sdXy) and prevent the system from picking the correct block > device for root filesystem in case the root filesystem is specified on > kernel command line using 'root=/dev/mmcblkNpM' (or 'root=/dev/sdXy' > etc.). > > One way out is to derive PARTUUID in U-Boot, which is unique identifier > of a partition, and pass that as root=PARTUUID=<partuuid> to Linux via > kernel command line. Linux would then find the partition using PARTUUID, > no matter on which block device the partition resides and which node was > assigned to that block device. > > Derive the PARTUUID before scanning for extlinux presence and assign it > into distro_bootpart_uuid environment variable, which can then be used > in extlinux.conf kernel command line specifier. > > Note that it is not possible to do this in scan_dev_for_extlinux script > because this script is called from scan_dev_for_boot script, which is > called for both block devices as well as UBI volumes, and we can not > derive PARTUUID for UBI volumes. > > Signed-off-by: Marek Vasut <[email protected]>
Applied to u-boot/master, thanks! -- Tom
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